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Other traffic news you need to know about

The cameras are 'speed on green' devices which when the lights are on red are used to catch people jumping stop lights at busy junctions.

Then when the lights are on green, these cameras switch to detecting speed, meaning if you go through the junction too quickly you will end up with a ticket - even though you probably didn't know there was a speed camera there.

Below is a list of all the 'hidden' cameras, and their locations.

How do they work?

Gatsometer BV, manufacturer of the UK's Red LightCameras, (named Gatso RLC 36) has been producing RLC's since 1966. The RLC system is triggered by sensors or ground loops that are cut into road surface as a vehicle passes over them, while a red light is shown.

The Red Light Camera was originally used to measure red light offences. Now the RLC can also be used in combination with speed measurement, similar to that of a Gatso Meter rear facing speed camera (radar type 24 technology) and can therefore also record the speed of the offending motorist as well.

Red light cameras are placed at traffic light controlled junctions and photograph vehicles that pass traffic lights set to red.

The detector triggers when a car passes over the loop - if the traffic light is also set to red, then the camera is triggered to take two photographs one second apart.

A data box is included in the photograph to show the date and time of the photographs, the speed of the vehicle as it passed the red light and, if necessary, a road lane identification.